Dry fire-extinguisher.



R. JARETZKI.

DRY FIRE EXTlNGUISHER.

APPLICATION FILED JULY 7, 1913.

Patented Jan. 25, 1916.

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RICHARD JARETZKI, 0F BERIIIN, GERMANY, AssIGNon'ro INTERNATIONALE FEUER- LoscHEn GESELLSCHAFT M. B. 11.. 0F BERLIN, GERMANY, A FIRM.

DRY FIRE-EXTI'NGUISHER.

Specification of Letters Patent.

Application filed July 7, 1913. Serial No. 777,715.

To all whom it may concern; I

lie.- it known that I, Riemann JARETZKI, a. subiect of the King of'Prussia, residing at lierlin. in the Kingdom of Prussia. in the German Empire, have invented certain new and useful Improvements in Dry Fire-Extinguishers; and I do hereby declare the following to be afull. clear, and exactdescription of the invention, such as will enable others skilled in the art to which it appertains to'make and use the same.

This invention consists of a further modification and improvement in dry fire extinguishers of the kind in which the extinguishing powder is propelled by an extinguishing gas under pressure. It has proved advantageous to remove the outlet opening for the extinguishing powder to the bottom of the powder container. because by this means the descending powder is more certainlv delivered to the outlet. Further, in

' the drv fire extinguisher constructed according to the present invention a. rotary motion of the escaping gas current is caused by means of a correspondingly sloping arrangement of the gas ducts whereby an intimate inter-mixture of the extinguishing gas and the extinguishing powder is assured. In the vicinity of the bottom. there is moreover .in the present invention ar ranged asieve in order to stop any coarser elements which may be present in the extinguishing powder. so that any stoppage of the outlet duct may be prevented.

In order to excludethe entrance of moisture into the container. according to this invention, there is provided a closing device in the form of. a plate which closes the bottom opening of the container. but which is so formed that it will break upon the access of the extinguishing gas under full pressure.

In the accompanying drawing is illustrated the construction of the apparatus as follows Figure 1 shows a vertical axial section through the apparatus. Fig. 2 shows a View of the escapcment duct for the extinguish,- ing gas viewed from above. and Fig. 3 shows a plan view of the closing plate. Fig. 4 shows a modification of the apparatus.

To the container 1 for the extinguishing powder; there is attached in the well known manner the container-,2 for the extinguishmg .gas, from which latter a pipe 3 leads into the interior of the extinguishing powder container 1. The exit opening for the extinguishing powder is placed at the bottom of the chamber 1 and the bottom wall 5 is preferably constructed shaped as a funnel. At the bottom of opening 4: there is connected the curved nozzle 6 for the powder mixture which is attached to the bottom opening I removably. preferably by means of the screw 7. In consequence of this arrangement, the filling of the powder container can take place after the removal of the nozzle 6 through the openmg 4. It is therefore not necessary to provide a removable cover having an air-tight closure as such a closure is complicated and diflicult to make tight. In this construction the cover can be soldered down. Opposite to the outlet opening I is arranged the system of the outletducts 8 for the extinguishing gas. downward and their outlet opening is moveover arranged in the direction of a very steep screw curve. so that on the rushing out of the extinguishing gas from the duct openings. a rotating gas whirlwind is produced. whereby the extinguishing powder coming from above receives an extraordinarilv complete intermingling with the extinguishing gas.

Over against the ducts 8 and 10 in the neighborhood of the bottom is placed a sieve 9 with large meshes of thin metal wire or the like. This sieve is to perform several services. As the bottom opening 4: also serves for the filling in of the extinguishing powder, the sieve will prevent any larger lumps of extinguishing powder from entering the interior of the receptacle 1. Such coarser pieces clog the outlet ducts, and may in some circumstances lead to the bursting of the extinguishing powder receptacle when the extinguishing gas 1s let into it. By means ofthe sieve however even such lumps of the extinguishing powder are held back which may have eventually been formed in the inserted powder by reason of moisture, because these lumps are retained by the sieve 9 or are broken up in it under the influence of the stream of gas. It is important to recognize that the meshes .of the sieve are not in any case greater than These ducts 8 aredirected sloping.

subdivided by against the fabric of the sieve. In order to sists ofa thin plate of radially to the outside,

are pulverized and better simultaneously striking inasmuch as both prevent in any event that moisture might penetrate into thejinterior of the extinguishing powder receptacle and give rise to the formation of lumps, the following construction is devised: The opening 4 in the bottom can be closed by means of a plate 10, which can be attached in any suitable manner-to the opening preferably by screwing on the duct/. provided with an internal projecting shoulder. This plate 10 conairtight and waterproof material. For this purpose a thin metal sheet, impregnated paper, membrane, rubber or the like can be made use of. According to the inventionthis closing plate is cut into at one side, preferably along radial lines as illustrated on the occurrence of a pressure on the plate, the tearing of]? of the grooved lines in the closing plate takes place and consequently theextinguishing gas passes into the powder container. In the construction illustrated there are arranged six radial grooves;

On the tearing open of the plate 10 the flaps IO shown dotted in Fig. 1, would be pro- -duced, which would be carried downward under the pressure of the escaping gas, so that the extinguishing powder and extinguishing gas would have a free exit through the closing plate.

groove of this kind in the closing-plate is important so that no large pieces of the closing plate should be possibly stop the outlet.

If, however, the plate is torn from the center outward then'the-flaps carried with it remain attached to the outer periphery of the plate and bend only toward in 'Fig. 3, so that The application-of a torn off which might provided in the side wallthereof, and a short and interiorly threaded neck 12 is formed about the opening to receive the threaded end 13 of the nozzle 6, which in this instance projects horizontally from the outlet. scribed with reference to Figs. 1 and 3,

The disk 10 is constructed, as dewith a threaded flange 7 arranged to be re ceived between the neck 12 and the end 13 of the nozzle 6, and to be clamped therebetween and held securely in position. The screen 9 is, as shown, arranged diagonally in the receptacle, and the distributing head is arranged on an axis at right angles to the screen, as will appear and be fully understood. 1

What I claim is -In a dry fire extinguisher, the combinationof'a receptacle for holding dry fire extinguishing powder and provided with an outlet at the bottom thereof, a gas tank, 'a pipe connecting said gas tank with the in terior of said receptacle and havingthe de-- livery end thereof arranged directly above and'in proximity to the outlet, and a distributing head mounted on the delivery end of said pipe and comprising a plurality of radial arms bent spirally downward, sub- RICHARD ARETZKI.

Witnesses:

*WOLDEMAR HAUPT,

HENRY HASPER. 

